參數(shù)資料
型號(hào)： LE79555-4VC
英文描述： Telecommunication IC
中文描述： 通信集成電路
文件頁(yè)數(shù)： 1/16頁(yè)
文件大?。?/td> 411K
代理商： LE79555-4VC
Publication#
080686
Issue Date:
January 2001
Rev:
A3
Amendment: /
0
Le79555
Subscriber Line Interface Circuit
The Le79555 Subscriber Line Interface Circuit implements the basic telephone line interface functions, and enables
the design of low-power, high-performance POTS line interface cards.
DISTINCTIVE CHARACTERISTICS
I
Ideal for high-density, low-power linecard
applications
I
Control states: Active, Reverse Polarity, Tip
Open, Ringing, Standby, and Open Circuit
I
Low standby power (35 mW)
I
–16 V to –58 V battery operation
I
On-hook transmission
I
Two-wire impedance set by single external
impedance
I
Programmable constant-current feed
I
Low Overhead Voltage (6 V)
I
Programmable loop-detect threshold
I
Ground-start detector
I
Programmable ring-trip detect threshold
I
No –5 V supply required
I
Current Gain = 500
I
Three on-chip relay drivers and relay snubbers,
one ringing and two general purpose
I
Tip Open state for ground-start lines
I
On-chip switching regulator for Low power
dissipation
BLOCK DIAGRAM
Controller
C3
RSN
Two-Wire
Interface
HPA
HPB
Signal
Transmission
Input Decoder
and Control
Ring-Trip Detector
Power-Feed
L
BGND
VCC
VBREF
RDC
CAS
VDC
AGND
VTX
VBAT
A(TIP)
B(RING)
DET
RYOUT1
RD
C1
C2
Relay
Driver
Relay
Driver
Ring Relay
Driver
DA
DB
RINGOUT
RYOUT2
D1
D2
Off-Hook Detector
Battery Switch
VBAT2
BATSW
VREG
Switching Regulator
CHS
QBAT CHCLK
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